Business Mathematics Lecture Note #9 Chapter 5
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1 1 Business Mathematics Lecture Note #9 Chapter 5
2 Financial Mathematics 1. Arithmetic and Geometric Sequences and Series 2. Simple Interest, Compound Interest and Annual Percentage Rates 3. Depreciation 4. NPV and IRR 5. Annuities, Debt Repayments, Sinking Funds 6. Interest Rates and Price of Bonds
3 Arithmetic and Geometric Sequences and Series Sequence : A list of numbers which follow a definite pattern or rule. 1. Arithmetic Sequence : Each term, after the first, is obtained by adding a constant, d, to the previous term, where d is called the common difference 2. Geometric Sequence : Each term, after the first, is obtained by multiplying the previous term by a constant, r, where r is called the common ratio
4 Arithmetic and Geometric Sequences and Series Series : The sum of the terms of a sequence. Finite series: the sum of a finite number of terms of a sequence Infinite series: the sum of an infinite umber of terms of a sequence 1. Arithmetic Series (Arithmetic Progression, AP) : the sum of the terms of an arithmetic sequence. 2. Geometric Series (Geometric Progression, GP) : the sum of the terms of a geometric sequence.
5 Arithmetic Sequences and Series
6 Arithmetic Sequences and Series
7 Arithmetic Sequences and Series
8 Geometric Sequences and Series
9 Geometric Sequences and Series
10 Geometric Sequences and Series
11 Application of Arithmetic and Geometric Series A manufacturer produces 1,200 computers in the first week. But after week 1, it increases production by: i) scheme I: 80 computers each week Ii) scheme II: 5% each week. (a) Find out the production quantity in week 20 under each scheme. (b) Find out the total production quantity over the first 20 weeks under each scheme. (c) Find the week in which the production quantity reaches 8,000 or more for the first time under each scheme.
12 Application of Arithmetic and Geometric Series
13 Application of Arithmetic and Geometric Series
14 Application of Arithmetic and Geometric Series
15 Application of Arithmetic and Geometric Series
16 Assignment #2 Problems 1, 9, 10, 11 of Progress Exercises 5.1 Due on 2013/05/02 (Thursday)
17 Simple Interest
18 Simple Interest
19 Simple Interest
20 Compound Interest
21 How compounding is carried out (when annual interest rate i %) The next slide demonstrates.how interest is calculated at the end of each year.interest earned is added to the principal.principal at the start of next year = (principal + interest) from previous year 21
22 The table below will be filled in, row by row..to demonstrate the idea of compounding annually at an interest rate i % Amount at start of year = principal Interest earned during year Amount at end of Year = principal + interest Year 1 P 0 ip 0 P 0 + ip 0 = P 0 (1+ i) = P 1 Year 2 P 1 ip 1 P 1 + ip 1 = P 1 (1+ i) = P 2 Year 3 P 2 ip 2 P 2 + ip 2 = P 2 (1+ i) = P 3 In general, at the end of year t. Year t P t-1 ip t-1 P t-1 + ip t-1 = P t-1 (1+ i) = P t 22
23 Compound interest formula (II) principal + interest P 0 + ip 0 = P 0 (1+ i) = P 1 Next year P 1 + ip 1 = P 1 (1+ i) = P 2 Next year P 2 + ip 2 = P 2 (1+ i) = P 3 In general. BUT, in terms of P 0 so P 1 = P 0 (1+ i) But P 1 (1+ i) = P 0 (1+ i) (1+ i) so P 2 = P 0 (1+ i) 2 But P 2 (1+ i) = P 0 (1+ i) 2 (1+ i) so P 3 = P 0 (1+ i) 3 P 4 = P 0 (1+ i) 4..and so on.p t = P 0 (1+ i) t 23
24 Worked Example 5.5 (see text) Calculate the amount owed on a loan of 1000 at the end of three years, interest compounded annually, rate of 8% you will need.. P t = P 0 (1+ i) t..the compound interest formula Method Substitute the values given into the compound interest formula t = 3 years P 0 = i = = Calculations P 3 3 P0 ( 1i) (1 0.08) (1.08) 1000( )
25 Terminilogy: present value; future value In the compound interest formula; P t = P 0 (1+ i) t P t is called the future value of P 0 at the end of t years when interest at i% is compounded annually P 0 is called the present value of P t when discounted at i% annually see following examples 25
26 The present value formula is deduced from the compound interest formula as follows: P P (1 i) t 0 t P (1 t i) t P 0 (1 (1 i) i) t t (1 P t i) t P 0 P 0 (1 P t i) t 26
27 Worked Example 5.6 (a)(i) 5000 is invested at an interest rate of 8% for three years You will need P t = P 0 (1+ i) t..the compound interest formula Method Substitute the values given into the compound interest formula t = 3 years P 0 = i = = Calculations P 3 3 P0 ( 1i) (1 0.08) (1.08) 5000( )
28 Revise terminilogy: present value; future value In the compound interest formula; P t = P 0 (1+ i) t future value present value In Worked Example 5.6 P t = is called the future value of P 0 = 5000 at the end of 3 years when invested at 8% compounded annually P 0 = 5000 is called the present value of P t = when discounted at 8% annually for 3 years 28
29 Worked Example 5.6(b)(i) Present value calculations ( discounted at 8% annually for three years) P 0..the present value formula will be required Method Substitute the values given into the present value formula t = 3 years P t = i = = P (1 t i) t Calculations P 0 P 3 ( 1 i) (1 0.08) (1.08)
30 Worked Example 5.6 (b)(ii) Present value calculations ( 15,000 discounted at 8% annually for three years) P 0..the present value formula will be required Method Substitute the values given into the present value formula t = 3 years P t = 15,000 8 i = = P (1 t i) t Calculations P 0 P 3 ( 1 i) (1 0.08) (1.08)
31 How to compound twice annually (rate = i % pa) P P P (1 i) t t P 0 0 i 1 2 At each compoumding t 2t..compounding once annually..compounding twice annually Two compoundings necessary in 1 year use the annual rate, i, divided by 2 2 x t compoundings necessary in t years 31
32 How to compound three times annually (rate = i% pa) P P P (1 i) t t P 0 0 i 1 3 t 3t..compounding once annually..compounding three times annually At each compoumding use the annual, I, rate divided by 3 Three compoundings necessary in 1 year 3 x t compoundings necessary in t years 32
33 How to compound m times annually (rate = i% pa) P t P P (1 i) t 0 P0 1 i m t mt..compounding once annually..compounding m times annually At each compoumding use the annual rate,i, divided by m m compoundings necessary in 1 year m x t compoundings necessary in t years 33
34 Compounding continuously P P (1 i) P t t P t 0 P0 1 t i m P 1 mt i m m compounding once annually compounding m times annually t 0 rearranging i e t Pt P0 P0 e it Pt P0 e it 1 i m m e i as m 34
35 Worked Example 5.8 (a) is invested at an interest rate of 8% for three years compounded semiannually you will need the formula.. P t P 1 mt Method Substitute the values given in the question into the compound interest formula above m = 2 t = 3 years P 0 = i = = i Calculations 0 m3 m i P3 P0 1 m P (1 0.04) (1.04) 5000( )
36 Worked Example 5.8 (c)(i) is invested at an interest rate of 8% for three years compounded monthly you will need the formula.. mt P t P 1 i m Method Substitute the values given into the compound interest formula above m = 12 t = 3 years P 0 = i = = Calculations 0 m i 3 P3 P0 1 P 3 m ( )
37 Worked Example 5.8 (c)(ii) 5000 is invested at an interest rate of 8% for three years compounded daily (assume 365 days per year) you will need the formula... P t Method Substitute the values given into the compound interest formula above m = 365 t = 3 years P 0 = 5000 P0 1 8 i = = i m mt Calculations P P 3 3 P ( ) 5000( ) i m m
38 Worked Example is invested at an interest rate of 8% for three years compounded continuously you will need the formula... it Pt P0 e Method Substitute the values given into the compound interest formula above t = 3 years P 0 = i = = Calculations P e P e 0 i3 P3 5000e ( )
39 How much do you gain when interest is compounded more than once annually? Review results in Worked Examples 5.6, 5.7 and is invested at a nominal interest rate of 8% for three years but compounded at various intervals annually. The future value at the end of 3 years was calculated: compounded once annually compounded twice annually compounded monthly compounded daily compounded continuously 39
40 How much do you gain when interest is compounded more than once annually? Review results in Worked Examples 5.6, 5.7 and is invested at a nominal interest rate of 8% for three years but compounded at various intervals annually one conversion period conversion periods conversion periods conversion periods infinete conversion periods (continuous) 40
41 How much do you gain by compounding more than once annually? Conversion periods/year Amount at end of 3 years Difference over annual compounding = = = Infinitely many (continuous) =
42 How do we make comparisons when different conversions periods are used? Use Annual Percentage Rates: APR What is the APR? The APR is the interest rate, compounded annually that yeilds an amount P t the same amount P t would be yeilded when any other method of compounding is used, for example.. 42
43 Annual Percentage Rates: APR P t calculated using the APR rate annually is the same as P t calculated by any other method mt P t P0 1 P t P 0 e it i m P P (1 APR) t 0 t 43
44 Calculate the APR when interest is compounded m times annually P t P0 1 i m mt compounding m times annually at a nominal rate of i % p.a. P P (1 APR) t 0 t compounding once annually at APR% p.a. But P t is the same whcihever method is used, hence P 1 t 0 ( 1 APR ) P0 i m mt Next slide 44
45 Calculate the APR when interest is compounded m times annually But P t is the same whcihever method is used, hence P 1 t 0 ( 1 APR ) P0 i m mt t i ( 1 APR ) 1 m m (1 APR ) 1 APR i m m mt i 1 1 m 45
46 Calculate the APR when interest is compounded continuously But P t is the same whcihever method is used, hence t P0 ( 1 APR) 0 P e it (1 APR) e t it i (1 APR) e APR e i 1 46
47 Calculate the APR: Progress Exercises 5.4 no 11(a) P t is the same whcihever method is used, hence (1 APR ) (1 APR ) ( 1 APR ) APR
48 Calculate the APR Progress Exercises 5.4 no 11(d) But P t is the same whcihever method is used, hence P 3 0 (1 APR) P 0 e (1 APR) 3 e ( 1 APR) e 0.06 APR e
49 Assignment #3 Problems 4 and 6 of Progress Exercises 5.2 Problems 5, 6, 15 of Progress Exercises 5.3 Problems 5, 6 of Progress Exercises 5.4 Due on 2013/05/07 (Tuesday)
50 Depreciation Depreciation: allowance made for the wear and tear of equipment during the production process which involves reduction of the asset value. There are two depreciation methods: 1. Straight-line depreciation subtracts equal amount from the original asset value each year. This is the converse of simple interest. 2. Reducing-balance depreciation subtracts equal rate from the asset value of the previous year. This is the converse of compound interest.
51 Depreciation
52 Depreciation
53 Worked Example 5.11
54 Worked Example 5.12
55 NPV and IRR NPV and IRR are the two techniques which are used to appraise investment projects (or investment alternatives). More specifically, NPV and IRR are used to determine whether to invest in a certain investment project, or are used to select one or a few among many investment alternatives. NPV(Net Present Value) IRR(Internal Rate of Return)
56 Net Present Value(NPV) NPV is the sum of the present values of several future cash flows discounted at a given rate. NPV uses present values to appraise the profitability of investment projects. While calculating NPV, a given discount rate (i) is used to convert all future cash flows into present values. Each Cash flow is either cash inflow or cash outflow. Cash inflow is a return from the investment. Cash outflow is a cost or money to be invested.
57 Net Present Value(NPV)
58 Calculating NPV Year (t) Cash flow 0-400, , , , , , , , , ,254 43,956
59 Internal Rate of Return(IRR) In the previous example of calculating NPV, discount rate of 8% was used. As a result, NPV=$43,956 was obtained. The value of NPV, however, changes as the discount rate changes. If the discount rate increases, the NPV decreases. If the discount rate is increased to %, the NPV becomes zero. If the discount rate is further increased to 15%, the NPV would result in a negative value. (See Table 5.4 on page 232) IRR is the discount rate at which the NPV is zero. For the previous example, the IRR is %
60 Internal Rate of Return(IRR) Decision rule for using IRR: Invest in the project, if IRR > market rate of interest Do not invest in the project, if IRR < market rate of interest
61 (1) Graphical method Calculating IRR Calculate NPV s for several different discount rates so that NPV s range from positive to negative values. Then, plot the points of (discount rate, NPV) on a graph where the horizontal axis represents discount rate and the vertical axis represents value of NPV. Then connect the points to get a curve. The value of the discount rate of the point at which the curve crosses the horizontal axis is the IRR.
62 Calculating IRR
63 Comparison of NPV and IRR When comparing the profitability of two or more projects, the most profitable project would be the project with the largest NPV which would be the project with the largest IRR. Advantage of using NPV: results are given in cash terms Disadvantage of using NPV: results change when discount rate is changed Advantage of using IRR: results are independent of any external rates of interest Disadvantage of using IRR: does not differentiate between the scale of projects. Higher IRR with smaller NPV due to small scale of the project.
64 Comparison of NPV and IRR Project I (discount rate = 10%) Project II (discount rate = 10%) year Cash flow Discount factor PV year Cash flow Discount factor 0-100, , , , NPV of Project I = 9,091 NPV of Project II = 35 PV
65 Compound Interest for Fixed Deposits at Regular Intervals of Time
66 Compound Interest for Fixed Deposits at Regular Intervals of Time
67 Compound Interest for Fixed Deposits at Regular Intervals of Time
68 Compound Interest for Fixed Deposits at Regular Intervals of Time Worked Example 5.15 New members of a golf club are admitted at the start of each year and pay a joining fee of $2,000. Henceforth members pay the annual fee of $400, which is due at the end of each year. How much does the club earn from a new member over the first 10 years, assuming annual compounding at an annual interest rate of 5.5%.
69 Compound Interest for Fixed Deposits at Regular Intervals of Time
70 Annuities
71 Annuities
72 Worked Example 5.16 Annuities To provide for future education, a family considers various methods of saving. Assume saving will continue for a period of 10 years at an interest rate of 7.5% per annum. (a) Calculate the value of the fund at the end of year 10 when equal deposit of $2,000 is made at the end of each year. (b) How much should be deposited each year if the final value of the fund is $40,000? (c) How much should be deposited each month if the final value of the fund is $40,000?
73 Annuities
74 Annuities
75 Annuities
76 Annuities
77 Annuities
78 Annuities
79 Debt Repayment We say a loan is amortized if both principal and interest are to be paid back by a series of equal payments made at equal intervals of time assuming a fixed rate of interest throughout. Mortgage is an amortized loan used to purchase a real estate (house or building) by offering the real estate to be purchased as a collateral. Mortgage repayment is one type of debt repayment(or loan repayment).
80 Debt Repayment
81 Debt Repayment
82 Debt Repayment
83 Sinking Funds
84 Sinking Funds
85 Sinking Funds
86 Assignment #4 Problems 3 of Progress Exercises 5.5 Problems 2, 3, 5 of Progress Exercises 5.6 Due on 2013/05/09 (Thursday)
You will also see that the same calculations can enable you to calculate mortgage payments.
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